How the Heart Works - The Heart | NHLBI, NIH
https://www.nhlbi.nih.gov/health/heart
WEBMar 24, 2022 · The heart is an organ about the size of your fist that pumps blood through your body. It is made up of multiple layers of tissue. Your heart is at the center of your circulatory system. This system is a network of blood vessels, such as arteries, veins, and capillaries, that carries blood to and from all areas of your body.
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